Office desk



FIG. 1 is a perspective view of an office desk, showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a rear perspective view thereof, taken from above; and,

FIG. 5 is a rear perspective view thereof, taken from below. 

The ornamental design for the "office desk", as shown and described. 